[jira] [Created] (TAJO-1911) Change guava's Optional to Java's Optional.

[Hyunsik Choi (JIRA)]

Hyunsik Choi created TAJO-1911:
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             Summary: Change guava's Optional to Java's Optional.
                 Key: TAJO-1911
                 URL: https://issues.apache.org/jira/browse/TAJO-1911
             Project: Tajo
          Issue Type: Sub-task
            Reporter: Hyunsik Choi
            Assignee: Hyunsik Choi
            Priority: Trivial
             Fix For: 0.12.0


See the title. This patch changes all Optional of guava to native ones.



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